Marcel Taeumel uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-mt.1403.mcz

==================== Summary ====================

Name: System-mt.1403
Author: mt
Time: 27 March 2023, 10:00:56.498651 am
UUID: 106cd43c-6be0-314c-ac46-e16bf55f8a89
Ancestors: System-eem.1402

As usual, move domain-specific string/text messages into extension protocol. Use *System-Support for now but it could be *Network as well or something that relates to the underlying MIME classification (here: text/plain).

=============== Diff against System-eem.1402 ===============

Item was added:
+ ----- Method: String>>isPlainText (in category '*System-Support') -----
+ isPlainText
+ 	"For compatibility with Text"
+ 	^true!

Item was added:
+ ----- Method: Text>>isPlainText (in category '*System-Support') -----
+ isPlainText
+ 	"A Text with no emphasis has empty values."
+ 	^runs values = #(#())!